Hours: We are open 24/7

2183 West Terra Lane, O'fallon, MO 63366

(314) 513-0385

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Company Profile

Purpose: To create a comfortable and healthy living space by providing the highest degree of quality installation and service work in the residential and light commercial marketplace with honesty and integrity.

Founded: Reliable Heating & Cooling Company was founded in 1972 by Ken and Marilyn Patterson. The company incorporated on March 20, 1980.

Our Story

Ken and Marilyn Patterson started Reliable Heating & Cooling from their home in Florissant, MO in 1972. In those years, Reliable was primarily a “one-man” shop. Ken was our salesman, service technician, and installer. As the company grew, Marilyn became actively involved in the business answering phones, paying bills, and keeping the bookkeeping records.

In 1980, Reliable Heating & Cooling incorporated and the business moved to Airport Rd. in Berkeley. During the early 1980’s, Ron Hicks and Marty Galucia installed central air conditioning in many homes that had never had it previously. And, in 1983, the company re-located back to the Florissant area. Reliable was one of the first HVAC companies to have radio dispatched technicians. Reliable also purchased box trucks and fabricated our sheet metal on the job in our “rolling” sheet metal shops. Our installers still fabricate metal on the job to ensure a professional looking transition to your existing ductwork.

In 1991, the company built our current building in Vinita Park, MO. During the 1990’s, Reliable continued to provide quality installation and service to our community. In 1994, Ken hired Ralph Frank as a service technician, and in 1997 hired Mike Schumacher as our outside sales representative. Continuity is important in any business, especially as a family business is passed down from one generation to the next. Reliable is proud to have customers that have continually used our services year after year. Reliable Heating & Cooling is now replacing systems we installed over 20 years earlier. We greatly appreciate the loyalty of such customers. We are blessed to have quality employees, many of whom have been with the company over 10 years. Ken and Marilyn Patterson are enjoying semi-retirement, but the foundation of quality installation and service with integrity carries on. The quality people Ken and Marilyn hired and trained years before, are now managing the day-to-day operations. Marty Galucia, hired as an installer, is now President of the Company. Mike Schumacher is now our General Manager, Ron Hicks is now our Installation Manager, and Ralph Frank is now our Service Manager. These individuals, and all of the employees at Reliable Heating & Cooling look forward to serving you with the same Christian principles and ethics you’ve come to expect.

Read how we are going green!

AC Service, HVAC Installation, Air Conditioning Installation, AC Repair & Air Conditioner Repair O Fallon, MO, Saint Peters, MO, Lake Saint Louis, MO, Wentzville, MO & Saint Charles, MO

HVAC Installation in O Fallon, MO | AC Repair Saint Peters, MO | AC Service Lake Saint Louis, MO

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Customer Reviews
What our customers are saying

Have been with them for more than 10 years. They provide exceptional service…from the time they call to remind you about setting an appointment to the actual service day. Derek (and all their other technicians) are knowledgeable, professional, prompt, and open to listening to questions and pay attention to details. Never had a problem with anything. Thank you for a job well done. Good pricing.

Seema Chouhan

We had a emergency water leak problem with our AC unit in the basement of our recently purchased condo. Called Reliable and Derrick was there within a couple of hours. He was polite, knowledgeable, and friendly. Derrick quickly found the problem and repaired it. He also checked the system overall, pointed our some concerns and answered all my questions. I can’t say enough about how satisfied we were with Derrick and Reliable Heating & Cooling! We would definitely recommend them!!! Thanks again!!!!

Terry Mills

I had a system malfunction on Sunday evening December 12, 2022 on my Carrier Infinity ICS purchased in 2008.I am a first time caller to Reliable. Marty called me back and had his Tech dispatched at 8 AM the next day. The unit had failed and was dangerous to use. He had a new system by the next morning. They installed it and I was completely satisfied with their service and response time. I overwhelmingly recommend Reliable and will be using them from now on.


We have used Reliable Heating and cooling for all of our heating and cooling needs. We needed some water heater work and Ralph came out and took care of it right away. Ralph was very professional and knowledgeable. He got the job done very quickly and everything is working great! I always recommend Reliable to family and friends. They truly are Reliable!

Chris Lopez

Reliable has installed and maintained our last 2 furnaces and AC. Our experience with them has been great. Just yesterday we had an issue with our AC. I talked to Marty and he said he’d have someone out the next day. They even were able to accommodate us with an afternoon call. Derrick arrived promptly on time and had us up and going again in 15 minutes (bad capacitor on the condenser unit fan motor). With the prediction of high 90 temps, we were so thankful to have AC working again.

Keith Scherer

Had a small gas leak for a property I was helping a friend sell and we found out late last night. We reached out to Reliable H&C and Derrick was over first thing in the morning. He was friendly, professional and knowledgeable. He answered my questions with a smile. Derrick was a rock star. Will absolutely call him again. Bravo

Connor Kapp

Chesterfield, MO

Winfield, MO

Moscow Mills, MO

Cottleville, MO